Rapid magnetizing and demagnetizing metal alloys



Patented Nov.

UNITED STATES I 1,692,690 PATENT OFFICE.

sInNnY ossnn, or WICHITA, KANSAS.

RAPID MAGNETIZING AND DEMAGNETIZING METAL ALLOYS.

mi Drawing.

scribed, whereby the efliciencyof such devices or instruments may be lncreased, to

wit, a metal having extremely rapid magnetizing and demagnetizing qualities and which is capable of high saturation with low re-' luctance and, when demagnetized, of being devoid or substantially devoid of residual magnetism. I

A further object of the invention is to provide a rapidly magnetizing and demagnetizing metalalloy which possesses proper relative' degrees of hardness and ductility for the purpose, which maybe manufactured and sold at a comparatively'low cost, and which when machined or worked in any of the I usual ways will take a very smooth finish;

. ,Incarrying my invention into practice I provide a metal alloy which mayvary to certain degrees in the-proportions of some or all of the ingredients employed, but the following composition gives very satisfactory in this composition'the phosphorus gives a desired degree of hardness, andthemanganese, in the proportionemployed, gives the requisite de reeof toughness without im-- "pairment 0 relative magnetizing and demagnetizing coefficiencies. It is desirable, however, to keep the proportion of'manganese content as low as possible, consistent with the production of a good working metal,

tar-dance actions interfering with rapid magnetization of the metal to a high saturation point and its rapid demagnetization at which practically no residual magnet-ism. exists. The sulphur 1n this CQIIIPOSItIOBGXI SiJS as an Application filed June 2 6,

1926. Serial No. 118,640.

unavoidable impurity, and the same is largely true of the carbon, although in the use of certain grades of iron carbon up .to the amount named may be used for its hardening eileet. The sulphur and-carbon content, however, should be kept as low as possible, as these elements are of no particular importance so far as the electrical qualities of the metal are concerned. The silicon gives ductility and renders the metal readily annealalole.

The combination of iron, manganese, phosphorus and silicon, combined in the PI'OPOI? tions or substantially in the proportions named, gives to this metal the novel and peculiar electrical qualities especiallyadapting it for use in electrical instruments or devices of the character set forth. While the proportions set forth are preferred they may be varied tocertain degrees, particularly with regard to the silicon and phosphorus, without unduly changing the electrical efiiciency. of the metal. Thus',-for example, the proportions of the phosphorus may vary from 103% to 15% or more, and the silicon from .0370 to .10% or more, without undesirably changing the physical or electrical qualities of the metal. The metal alloy resulting from the combination of the constituents noted is a magnetic metal having the peculiar property of becoming magnetized with great rapidity under the influence of an electric current and of. becoming rapidly demagnetized when the flow of current is arrested, these actions occurrin with much greater rapidity than is possib e with any other metal with which I am familiar. Practical demonstrations show.

tically no residual factor, making it very valuable for" use in electromagnets, transformers and other electrical instruments and ing actions and the avoidance of retardance actions of various kinds. It may be cast, rolledor otherwise formed into shape, readily annealed, easily. machined-i or otherwise worked, will take; a smoothfin'ish, and may bprodueed at acomparatively low cost.

Having thus fully-describedfniy invention, lclaimz' 1 f 1. A rapidly magnetizable' anddemag netizable metal alloy resulting from acom- .bi ti of orv including ironfmanganese,

to 15%, and silicon, from- 3% to .5%,land" devices for rapid energizing and deenergizi 2110 substantially .5l%, phosph orns, from .10%

iron sufiicient in quantity to make the other ingredients according to the percentages employed 100%.

2. A metal alloy of the character and for 8 the purpose described formed from a combination of carbon 12%, manganese .51%, phosphorus 103%, sulphur 090%, silicon 03%, and iron 99.147%.

3. metal alloy of the character end for I 

